the rest of drivers/*: annotate ->poll() instances

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/net/ppp/ppp_async.c b/drivers/net/ppp/ppp_async.c
index 1b28e6e..bdc4d23 100644
--- a/drivers/net/ppp/ppp_async.c
+++ b/drivers/net/ppp/ppp_async.c
@@ -334,7 +334,7 @@ ppp_asynctty_ioctl(struct tty_struct *tty, struct file *file,
 }
 
 /* No kernel lock - fine */
-static unsigned int
+static __poll_t
 ppp_asynctty_poll(struct tty_struct *tty, struct file *file, poll_table *wait)
 {
 	return 0;